Spurs I felt tried to reinvent the wheel by not providing enough size next to Victor. Luke is still a solid backup but this may not be the series for him. During the championship years I remember the Spurs always had two centers, and backup PF to play along side Duncan. '99 it was Robinson-Perdue-Kersey-Rose, '03 Robinson-Willis-Rose-Ferry, '05 Nazr-Rasho-Horry, '07 Oberto-Francisco-Horry-Bonner, '14 Splitter-Baynes-Diaw-Bonner-Ayres. This year they only have Kornet but no other bigs whether it's PF or Center to play alongside Victor.
The game may have changed but the other teams remaining in the playoffs have more size than the Spurs from what I have seen.